Dynamo-electrical machine.



D.- H. ANDREWS & B. C. KETGHUM. DYNAMB ELECTRICAL MACHINE.

APPLICATION FILED JAN.17. 1912.

1,069,095. Patented Aug. 5, 1913.

smit s GFFICE.

siie'cifie'aticii of Lettefs Patent.

Patente Aug; 5,1913.

Application filed January 17, 1912. Serial No. 651,746.

To all whom it may concern:

. Be it knownthat we, DAVID H. Aminnws' and ERNEST O. KETCHUM; citizens of the United States of America, and residents of county of Middlesex and; State of Massachusetts,- and Boston, in the county of Suffolk and State of Massachu-g setts, respectively, have invented certain:

' provided with a brush 16 contacting with Newton, in the new and usefullmprqvements in Dyna-m0- Electrical Machines, of which the following is aspecification.

This invention relates to dynamo electri-- cal machines and particularly to that class of such machines in which the armature is composed of a plurality of disks and is driven direct at a high velocity from a high-speed motor, electric contact being made between said disks and their brushes by means of a film of mercu'rydeposited upon the peripheries of said disks adjacent to said brushes.

T e object of the present invention is to provide a means for preventing the film of mercury bridging across the space between two adjoining disks and electrically connectingthem.

The invention consists in certain novel features of construct-ion and arrangement of parts which will-be readily understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents an elevation of a machine embodying the features of this invention. Fig. 2 represents a vertical section of the same, the cutting,

plane being on line 22 on Fig.; 1. F i-g. 8 represents a detail in section of a portion of the armature. 4 represents an elevation of a ortion of one of the insulating rings, and li ig. 5 represents an end elevation of one of the disks of the armature and its surrounding ring. v

Similar characters designate like parts throughout the several figures of the drawlugs. p v

In the drawings 10 represents @361 pieces supported by suita lelegs and connected toget-ass by means of the members 11 Upon 12 in the center of which revolves a shaft 13 extending through andbeyond the ends of the end pieces 10. Within the confines of the connecting members 11 and midway between the end pieces 10 is an intermediate member 14 on which is supported a plural- -'ty of brushholders- 15 each of which is each end piece 10 is mounted a field magnet structed and operates substantiall the same as that shown in LettersPatent 0., 826,668,

issued July 9/}, .1906, t Ernest C. Ketchun the various disks of t e two armatures 17 on either side of the intermediate member 14 being connected in pairs and through the brushes 16 into series. as fully explained in said patent. As as been disclosed in said patent, it was found to be advisable to provide the periphery of the armature disk, revoluble at such a high speed, with a thin film of amalgam of mercury 01' similar material. This amalgam acts as a lubricant and prevents undue wear of either the brush 16 or the annularcopper ring 18 with which itcontacts and even w an passing over inequalities in the surface of the ring a perfect connection is assured at all times. e

In Letters Patent No. 966,8fi0, issued to the same inventor Au 1Q, 1910; was described an invention t at had for its particular object the provisien of a mea s for supplying this thin filin of amalgam of merc ry to the eriphery of the armature disks 17. In order to accomplish this object a receptacle 19 is secured to the upper connecting-members th? bottom (it said i-eceptacle being provided with a plurality of passages therethrough equidistant fr-cm the center ct said receptacle; from which passages extend a plurality of tubes 22, one for each disk forming a part of the armature 17. Each of these tubes 22 is so formed as to have its delivery opening adjacent to the periphery of one of the armature disks and to one of the brushes 16 co-acting therew th.

In order to provide a means for deposit ng the mercury upon the periphery of each disk in the immediate vicinity of the contacting end of the brush 16*, said brush is provided with an opening therethrough near said contacting end and one of the tubes, as for instance, 22* (see Fig. 2) is extended therethrough with its delivery end close to the periphery of said disk. As the disk revolves in the direction of the arrow a on Fig. 2 of the drawings, any mercury deposited on the periphery of the disk is im mediately carried to the contacting end of the brush 16* and insures an electric con tact between said brush and disk under all conditions.

The receptacle 19 is provided with a cap 23 threaded to the upper end thereof and having perforations therethrough for the admission of the atmosphere to act upon the amalgam of mercury or other liquid contained within the receptacle 19. The receptacle 19 is provided with suitable separating mechanism all as shown and described in said Letters Patent No. 966,840, said mechanism being driven by a bevel gear 30 which meshes with a bevel pinion 31 on a shaft 32 mounted in a. suitable bearing formed upon or secured to one of the end pieces 10 and having secured to its opposite end a bevel gear 34 meshing with a bevel pinion 35 secured to and revoluble with the armature Shaft 13.

In the operation of the mercury dropper the receptacle 19 is, partially filled with mercury and when the dynamo is in opera tion the revolution of the shaft 13, through the intermediate driving mechanism, causes the operation of the separating mechanism whereby a portion of mercury or other liquid contained within said receptacle 19 when this portion of the mercury will pass through the tube 22 to said armature disks.

This delivery of the mercury to the disk causes a film thereof to be deposited on the copper peripheral. band of the disk and thereby lubrica es the same and makes a perfect contact at all times with the coacting brushes.

The film of mercury is automatically coustautly replenished. by the portion of mercury selected from the contents of the receptacle 19 and transferred by means of the separating mechanism to one or the other of the feed tubes 22 leading to the different armature disks.

The disks 17 of the armature are separated by thin disks of insulating'material such as mica and the copper rings 18 are in a similar manner separated by annular insulating members 4C1 preferably triangular in cross section. These annular members 41 are positioned in grooves 42 in the side faces of said rings 18 and extend beyond the peripheries thereof, thereby forming separating walls which prevent any of the mercury deposited upon one of the copper rings 18 from bridg ing across to the next ring and forming a false circuit. Without these separating walls extending beyond the periphery of the armature this difiiculty has been found to exist, but the objection has been entirely overcome by the use of the annular members 41, and the mercury deposited on each ring 18 is confined to its own rin The annular members 41 preferably have a thin outer edge so that there is no outer surface upon which mercury may lodge.

It is believed that the operation and many advantages of the invention Will be thoroughly understood from the foregoing.

Having thus described our invention, we claim:

1. In a dynamo electrical machine an armature consisting of a plurality of disks, insulating plates between said disks, and an nular V-shaped insulating members interposed between said disks and extending beyond the peripheries thereof.

2. In a dynamo electrical machine, an armature consisting of a plurality of disks, an annular copper band surrounding the pcriphery of each disk, insulating members between said disks, and annular. insulating members between said copper bands and extending beyond the peripheries of said bands.

In a dynamo electrical machine, an armature consisting of a plurality of disks, an annular copper band surrounding the pe riphery of each disk and having grooves in its side faces, insulating members between said disks, and annular insulating members between said copper bands embedded in said grooves.

4. In a dynamo electrical machine, an armature consisting of a plurality of disks, an annular copper band surrounding the periphery'of each disk, insulating members between said disks, and annular V-shaped insulating members between said copper bands and having their thinner edges extending beyond the peripheries of said bands.

In a dynamo electrical machine, an armature consisting of a plurality of disks having peripheral copper bands and insulating members interposed between said disks having tapered edges extending beyond the peripheries of said disks.

6. In a dynamo electrical machine, an armature consisting of a plurality of disks having peripheral copper bands and insulatbands and extending beyond the peripheries 10 ing members interposed between said bands thereof thereby forming continuous Walls.

the edges of which extend beyond the pe- Signed by us at 4 Post Ofiice Sq., Boston, ripheries of said bands and form continuous Mass. this 6th day of January, 1912.

5 wells. v DAVID H. ANDREWS.

7. In a d namo electrical machine, an ar- ERNEST C. KETCHUM. mature con slisting of a plurality of disks Witnesses: having peripheral copper bands and annular WALTER E. LoMBARn,

insulating members between said copper NATHAN C. LOMBARD. 

